J. R. Nield wrote: > One other point: > > Page pre-image logging is fundamentally the same as what Jim Grey's > book[1] would call "careful writes". I don't believe they should be in > the XLOG, because we never need to keep the pre-images after we're sure > the buffer has made it to the disk. Instead, we should have the buffer > IO routines implement ping-pong writes of some kind if we want > protection from partial writes.
Ping-pong writes to where? We have to fsync, and rather than fsync that area and WAL, we just do WAL. Not sure about a win there. -- Bruce Momjian | http://candle.pha.pa.us [EMAIL PROTECTED] | (610) 853-3000 + If your life is a hard drive, | 830 Blythe Avenue + Christ can be your backup. | Drexel Hill, Pennsylvania 19026 ---------------------------(end of broadcast)--------------------------- TIP 5: Have you checked our extensive FAQ? http://www.postgresql.org/users-lounge/docs/faq.html
